How do I update the SQL Server 2008 to include the studio?

How do I update the SQL Server 2008 to include the studio?
Here is what I currently have on my machine:
I assume I am supposed to clidk on "SQL Server Installation Center"
From there I get this window:
and I assume I am supposed to click on the first item on the right side, "New SQL Server stand-alone installation or add features to an existing installation". Is this right?
When I do this, I am asked to "Browse For Folder" but every folder I have picked so far has been denied. What do I do?

yes. the first item. later down the wizard you will be able to select what items you want to install. It can be the client tools without the database server components or the whole thing. up to you. Be sure to select the Business Development Studio. that will come in handy!

that is not your installation media...that is where you have installed it before. as it says, this is not a valid installation folder. normally that is on a network drive. Talk with your IT department who helped you install previously.

hello, I had this same problem after deleting the data base of Sharepoint on my windows server standard. When I try to open sharepoint, it says that is not setup yet, so when I tried to setup it by the wizard, it asked me the name of the sql server, however it can not be found. Then, I tried to create a new one, but I was not able due the same issue: "is not a valid installation folder". Is there some way to find out the correctly directory ?